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The MediaWiki User's Guide is a good source of HOWTO information about the wiki software, especially the section For editors, which documents the format of text you type to create pages. There's a short tutorial available from the Editing help link at the bottom of each editing page. Use the Sandbox to learn about editing pages.

Wiki culture has been largely anarchist since Ward Cunningham created WikiWikiWeb back in 1995. Every page can be edited by anybody (or, here, by any registered user). Order is maintained by community norms and voluntary cooperation.